New user - no incoming calls

Hi All,

I am new to asterisk and have a problem with a system that I have been left in charge of. There is no sound for incoming calls at either end. Outgoing are fine. BT assure me that the problem is with my system despite nothing having changed recently.

Can anyone suggest anything that I can check? As far as I can tell, the call seems to be coming through correctly according to the console but like I said, I am a newbie.

Any advise or suggestions would be appreciated.